Rudder Torque / Cylinder Size Calculations

[mbrault]

Guys, I need your input here...
The project is going well here, but I just hit a little wall... I am switching from mechanical to Hydraulic control of my rudder and need to pick your brain a little:




1- I have calculated the maximum theorical force applied on my rudder for my application and would need someone to go over my calculations just to confirm and maybe point out some overlooked details...

2- Once I know the torque delivered on my rudder shaft, How do I go about determining the cylinder size (diameter, pressure rating...)

I Have posted all the calculations here: https://sites.google.com/a/konsultech.com/raw/home/safran


Thanks

[beetle]

Originally Posted by mbrault

Guys, I need your input here...
The project is going well here, but I just hit a little wall... I am switching from mechanical to Hydraulic control of my rudder and need to pick your brain a little:

1- I have calculated the maximum theorical force applied on my rudder for my application and would need someone to go over my calculations just to confirm and maybe point out some overlooked details...

2- Once I know the torque delivered on my rudder shaft, How do I go about determining the cylinder size (diameter, pressure rating...)

I Have posted all the calculations here: https://sites.google.com/a/konsultech.com/raw/home/safran


Thanks

I sure would like to know more about the boat before looking at the calculations - is this a powerboat, sailboat, catamaran, something else? Length, beam, displacement, sail area, etc.

Where are you going to be sailing it, and under which anticipated conditions?

- rob/beetle

[atoll]

look on the vetus marine parts site,they give all the calculations for new hydrahlic instalations

[speciald@ocens.]

Also will dpend on rudder type and size - balanced or not, skeg hung or not.

[mbrault]

Originally Posted by beetle

I sure would like to know more about the boat before looking at the calculations - is this a powerboat, sailboat, catamaran, something else? Length, beam, displacement, sail area, etc.

Where are you going to be sailing it, and under which anticipated conditions?

- rob/beetle

Rob
This is a restoration job of a SANTANA 39 by SCHOCK 1974 (sailboat).
- Displacement is 18K empty estimated to 23K Total.
- Beam is 118 inches
- Sail area approx 650 sq ft
- This ship will be sailing around the world for a few years.

Thanks, let me know if you need more info...

[mbrault]

The rudder is a skeg type, It is not compensated. Exact dimenssions on this link: https://sites.google.com/a/konsultec...aw/home/safran

[marinovich.91]

Hello guys I have a problem calculateing my ruder.

I tought I can make transformation from my ruder to squer rudder and calculate torque but it seems I did mistake.

What I should take in account calculateing my rudder torque and force.

Please help.

Edit:
As picture shows, but it is tilted to left for 15 degrees for sure.

[Emmalina]

and ?

[coopec43]

Have you visited these sites?


https://www.phoenixmarinesolutions.c...rine/calc.html



https://www.researchgate.net/publica...Shipping_Route


https://www.ls-france.com/en/power-a...lation-assist/